Shank and bit punch



J. nnsow.

SHANK AND BIT PUNCH. APPucAno'N FILED SEPT. 15, 1920.

Patentd Nov. 1, 1921.

2 SHEETS-SHEET I- .I. DITSON.

SHANK AND BIT PUNCH.

APPLICATION FILED SEPT. 15' 1920.

2 SHEETS -SHEET 2.

INYENTOR 9m I lll W rill w m .N MM mm. .8 v L Hfix o \N N W UNITED stares PATENT JESSE DI'I'SON, OF LITTLETON, COLORADO; ASSIGNOR T INGERSOLL-RAND COMPANY;

OF JERSEY CITY, 1\T EV] JERSEY, CORPORATION OF NEW JERSEY.

SHANK AND BIT PUNCH.

Specification of Letters Patent.

Application filed September 15, 1920. Serial No. 410,546.

' To all whom it may concern:

Be it known that I, Jnssn DrrsoN, a citizen of the United States, and a resident of Littleton, Arapahoe county, State of Colorado, have invented certain new and useful Improvements in Shank and Bit Punches, of which the following is a specification.

This invention relates to a shank and bit punch, for punching the shanks and bits of hollow drill steels and more particularly for use in clearing out and shaping the here at the end of the shank or in the bit especially during the sharpening operations.

The primary objects of the invention are to enable the pin or 'punch to be actuated rapidly and conveniently by means of an operating handle controlling'the pinning out mechanism, which handle also controls the gripping jaws for holding the drill steelor other article to be punched. I Another object of the invention is to control the operation of two reciprocating, pistonslin one cylinder by a'single valve con trolled from the operatin'ghandle, one piston being the clamping piston and" the other the pinning piston, with; operative connections between said piston and the c'lamping jaws and the pin orpunchj" f 1 To all of'thes e ends the inventi'onis shown in one of its; preferred formsin the accompanying-drawings, in which- 1 Figure 1 is atop'planview of the machine partly in horizontal'section on the;line1-'1 of Fig. 6, with the clamping jaw covers re moved. For the purpose ofjthis' viewthe valve ches't and valve are shown diagram.- matically'asif they were at theside of the cylinder in a horizontal plane instead Qo f underneath-the cylinder as actually con structedand shown i-n Figs. t and 6,

'Fig. 2isa detail Perspective view of the' clamping dog,

v Fig. 3 'isa detail perspective-1 view'jof the clamping dog carriage, f

1 Fig.4: is a longitudinal sectional'elevation through the machi-ne onthe line 4+4of Fig. 6 looking in thedirection of the arrows;

Fig. 5is a detail'longitudinal sectional view of the valve chest and valve, with the valve in a'difi'erent'position from that shown in fge nd? Fig. 6 is a transverse sectional elevation through the clamping' frame' and clamping jaws onthe line 6+6 of Figi l, loo k i ng' in the direction "of theflarrowsP Referring to the drawings, upon the base A is mounted a clamping frame B suitably secured thereto as by means of the cap screws C. A cylinder D is suitably secured to the head E of the clamping frame as by means of the cylinder head cap screws F. A drill steel Gr, is adapted to be inserted between suitable clamping members on the clamping frame and automatically clamped in position while the pin H is automatically thrust for- The reciprocating movements of the clamping and p1nn1ng-p1stons L andO are controlled by a suitable valve P in the valve chest Q suitablymounted adjacent the cylinder D and preferably beneath the same, as shown in Figs. 4 and 6, although for clearness and to avoid multiplication of figures,

the section throughthe valve chest in Fig.1

is'assumed to be taken as if the valve chest was swung upwardinto 'a horizontal at the side of the cylinder.

V The valve lever J may be pivoted on the stud'R underneath the clamping frame 13' u'nderpressure is admitted to the valve chest Q at the inlet connection U and as the-valve P is moved from one position to another,

,the clamping, punching and pinning out op erations are automatically carried out in the required order.

In the COIIStI'L'lCtlOHOf the machine diifer ent' forms of clampinginechanism may be devised, but I- have found that the devices shown in the drawings operate satisfactorily andwell. The clamping piston L is secured to one end of a hollow piston rod on as by means of the nut b,- and a clamping cross head 0 is secured to the other end of said piston rod, as bymeans of the nut (Z. The clamping cross head 0 is provided with cross head rods e suitably secured thereto having cross head rod spacers ,f in the form of sleeves or tubes arranged over therods and plane clamping wedges g are secured to the outer ends of the rods 6 between the spacers and the nuts h. The clamping wedges g are provided with diagonal outwardly converging grooves j in top and bottom, which cooperate with clamping members for clamping and unclamping the drill steel G as the clamping piston L reciprocates in the cylinder D. As the clamping piston L moves forward, or to the right as the figures are viewed, the steel is unclamped and this position is shown in Fig. 4. Inward movement of the clamping piston L clamps the jaws or clamping members as indicated in Fig. 1.

A clamping jaw is, as shown, embraces one wedge g and is provided with .pins 0 at top and bottom lying in the grooves j in the wedge so that a transverse movement is imparted to the jaw Z; in accordance with the longitudinal movement ofthe wedge. The clamping jaw is guided as shown by the guides 0'.

A clamping dog carriage p embraces the other wedge g and is provided with pins 0 at top and bottom lying in the grooves in said wedge so that atransverse movement is imparted to said clamping dog carriage in accordance with the longitudinal move ment of the wedge. The'clamping dog carriage is also guided by the guides 0. The

clamping dog carriage p is recessed at top and bottom at g to receive the clamping dog 1" having rounded bearing portions 8 upon which the clamping dog rocks in the bottom of the recesses Q in the clamping dog carriagep. Thedog-r is provided with guide pins 25 which enter the recesses u in'the clamping dog carriage and lie in the grooves j in the wedge 9 so that the, clamping dog is held in the carriage. Coiled springs o are provided with downward extens1ons w embracmg the dog and. lying in guide grooves 02 in thedog and passing through elongated holes 1 in the clamping dog car riage so that the extensions 20 of the springs may have a slight play in the holes The springs '0 tend to center the dog and return it to normal central positioninthe clamping dog carriage aftert-he dog hasrocked in eitherdirectio n. Vi hen a drill steel G is clamped between the clamping jaw 7 and the dog 1* in position for the punching operation,-any tendency of the drill-steel to move away from the punching pin out of the clampingm-embers,-will cause the dog to grip the steel more firmly.

The pinning piston (He provided with the piston rod 2 passing through the. hollow clamping-piston rod a and provided-with the pin punch H at its outerend, suitably and removably secured thereto as-by means of the pin clamping nut 3. The pin H is preferably. guidedin the. pin guide ccarried on the claniiping' frame in any. suitable manner and the pin H is pushed forward and pulled back by movement of the pinning piston O. The clamping piston is provided with a stuffing box glandoof any suitable construction and the clamping members for the drill steel may be provided with suitable jaw covers 6.

The valve lever J may conveniently be provided with a suitable spring pressed pawl or stop 7 adapted to be grasped by the fingers of the operators hand and when this pawl or stop 7 is in the central notch 8 of the segment 9, the power is off and the partsare in the position as indicated in Fig. 4 with. the clamping piston L and the pinning piston (V) at opposite ends of the cylinder D so that the clamping members are open and the pin is withdrawn. The controlling valve P is in the neutral positionindicated in Fig. 5 and after having permitted the fluid 'under pressure from the inlet U to pass through the passage 10 to the cylinder Dbe= tween the pistons L and'O, forcing them to the ends of their travel, has opened. the passage 10 to exhaust through thevalve chest and through'the atmospheric port 18. lressure has been exhausted from the ends of the cylinder throughthe passages 11 and 12 through the valve chest to the atmospheric port 14, the valve having vpassedthrough the position indicated inFigzA: in reaching neutral position.

As the valve lever J is moved forwardlyin the directionsof the arrow 15 ,in'Fig. 1, the

valve P passes from neutral position to the position indicated in Fig. 1, and in so doing, motive fluid is first'admitted to the front end of the cylinder D in front of-the clamp,-

ing piston L, through the passage 11,- and pressure is exhausted from behind the piston through the passage 10, 50 that as, 'the piss I ton moves backward, the clamping members are actuated 'in the manner hereinbefore described to clamp thedrillsteellG, "As the valve; continues to move-rearwardly, the'pas- V sage 12 to .the rearend of the cylinder behind the pinning piston O isnext uncovered, while the passage 10 remains open to exhaust and the pinning piston 0 moves forwardly'to push the-pin into the-'drillsteel.

I indicated in said figure, in which case the passage 12 behind the pinning piston O," is

first opened to exhaust and pressure isfadmitted-in front of the pinning piston to drive it rearwardly and pull out the pin Continued forward movement of the valve then opens thepassagefll-in front of the clamping piston L to exhaust so that the clamping piston is drivenforwardj to release the clamped members from the-drilllsteel.

The valve lever J and valve P may then be returned to neutral position while the machine is not in operation.

I claim:

1. In a shank and bit punch, the combination of clamping members for clamping the article to be punched, a cylinder, a clamping piston and a pinning piston reciprocating in said cylinder, operative connections between the clamping piston and the said clamping members, a pin connected to be operated by the pinning piston and means for controlling the supply of motive fluid to said cylinder for operating said pistons.

2. In a shank and bit punch, the combination of clamping members, a cylinder, a clamping piston and a pinning piston reciprocating in said cylinder, operative connections between the said clamping members and the clamping piston for actuating said members, a pin connected to be actuated by the pinning piston and controlling means for the motive fluid supply of said cylinder whereby said clamping piston and said pinning piston are operated successively to clamp the article to be punched before the pin is operated, and to Withdraw the pin before the clamping members are released.

3. In a shank and bit punch, the combina-,

tion of means for clamping an article to be punched, a pin for punching said article, a cylinder, a clamping piston and a pinning piston reciprocating in said cylinder and means for controlling the operation of said pistons to clamp the article before punching and to withdraw the .pin before unclamping the article.

4. In a shank and bit punch, the combina' tion of clamping means for the article to be punched, a pin, a cylinder, a clamping piston and a pinning piston in said cylinder, a valve controlling the supply and exhaust of motive fluid to said cylinder in front of and behind each of said pistons and means for actuating said valve.

5. In a shank and bit punch, the combination of a clamping frame, clamping members mounted thereon, said clamping members comprising longitudinally movable clamping Wedges, a laterally movable jaw mounted on one of said wedges, a laterally movable clamping dog carriage mounted on the other Wedge, a clamping dog, connected to said clamping dog carriage, a cylinder mounted on said clamping frame, a clamping piston in said cylinder, operative connections be tween said clamping piston and the said wedges, a pinning piston in said cylinder and a pin actuated thereby, and means for controlling the supply and exhaust of motive fluid to sa1d cylinder for actuating said pistons.

In testimony whereof I have signed this specification.

JESSE DITSON. 

